1/*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef StylePendingImage_h
27#define StylePendingImage_h
28
29#include "core/css/CSSCursorImageValue.h"
30#include "core/css/CSSImageGeneratorValue.h"
31#include "core/css/CSSImageSetValue.h"
32#include "core/css/CSSImageValue.h"
33#include "core/rendering/style/StyleImage.h"
34#include "platform/graphics/Image.h"
35
36namespace blink {
37
38// StylePendingImage is a placeholder StyleImage that is entered into the RenderStyle during
39// style resolution, in order to avoid loading images that are not referenced by the final style.
40// They should never exist in a RenderStyle after it has been returned from the style selector.
41
42class StylePendingImage FINAL : public StyleImage {
43public:
44    static PassRefPtr<StylePendingImage> create(CSSValue* value) { return adoptRef(new StylePendingImage(value)); }
45
46    virtual WrappedImagePtr data() const OVERRIDE { return m_value; }
47
48    virtual PassRefPtrWillBeRawPtr<CSSValue> cssValue() const OVERRIDE { return m_value; }
49    CSSImageValue* cssImageValue() const { return m_value->isImageValue() ? toCSSImageValue(m_value) : 0; }
50    CSSImageGeneratorValue* cssImageGeneratorValue() const { return m_value->isImageGeneratorValue() ? toCSSImageGeneratorValue(m_value) : 0; }
51    CSSCursorImageValue* cssCursorImageValue() const { return m_value->isCursorImageValue() ? toCSSCursorImageValue(m_value) : 0; }
52    CSSImageSetValue* cssImageSetValue() const { return m_value->isImageSetValue() ? toCSSImageSetValue(m_value) : 0; }
53
54    virtual LayoutSize imageSize(const RenderObject*, float /*multiplier*/) const OVERRIDE { return LayoutSize(); }
55    virtual bool imageHasRelativeWidth() const OVERRIDE { return false; }
56    virtual bool imageHasRelativeHeight() const OVERRIDE { return false; }
57    virtual void computeIntrinsicDimensions(const RenderObject*, Length& /* intrinsicWidth */ , Length& /* intrinsicHeight */, FloatSize& /* intrinsicRatio */) OVERRIDE { }
58    virtual bool usesImageContainerSize() const OVERRIDE { return false; }
59    virtual void setContainerSizeForRenderer(const RenderObject*, const IntSize&, float) OVERRIDE { }
60    virtual void addClient(RenderObject*) OVERRIDE { }
61    virtual void removeClient(RenderObject*) OVERRIDE { }
62    virtual PassRefPtr<Image> image(RenderObject*, const IntSize&) const OVERRIDE
63    {
64        ASSERT_NOT_REACHED();
65        return nullptr;
66    }
67    virtual bool knownToBeOpaque(const RenderObject*) const OVERRIDE { return false; }
68
69private:
70    StylePendingImage(CSSValue* value)
71        : m_value(value)
72    {
73        m_isPendingImage = true;
74    }
75
76    CSSValue* m_value; // Not retained; it owns us.
77};
78
79DEFINE_STYLE_IMAGE_TYPE_CASTS(StylePendingImage, isPendingImage());
80
81}
82#endif
83